Hello!

I would like to change the color of active task in my taskbar. It currently looks like below, and I do not like this blue glow:



I think it is connected to workspace appearance ---> desktop theme ---> details ---> panel background / task items, but there is no way to modify it (or at least I can't find it). I tried using different colors in application apperance ---> colors ---> color, but it doesn't seem to work.

Thank you in advance for all your help

The elements of the task bar should (in theory) be controlled by the Plasma theme you are using. Plasma themes are made out of a metadata file and a series of SVG images, which contain the various elements used to build the entire appearance of the Plasma Desktop. It is likely one of these elements in a particular image contains the "glow" in question.

You should be able to find the default Plasma Desktop theme at $PREFIX/share/apps/desktoptheme/default/. The appropriate SVG image file for the Task Manager applet is widgets/tasks.svgz. You will need to use a program such as Inkscape to edit it.

More documentation on producing your own Plasma theme can be found on KDE Techbase (techbase.kde.org)